Table 1 Comparison of the general characteristics of the two groups
|  | Group A (n = 21) | Group B (n = 18) | χ2/t value | p value |
|---|---|---|---|---|
Sex (M/F) | 17/4 | 15/3 | 0.037a | > 0.05 |
Age (years), (x ± s) | 47.5 ± 8.5 | 46.6 ± 10.0 | 0.156b | > 0.05 |
Side of injured (R/L) | 10/8 | 11/10 | 0.039a | > 0.05 |
BMI | 22.3 ± 2.0 | 22.2 ± 2.1 | 0.096a | > 0.05 |
Smoking | 5 | 4 | 0.140b | > 0.05 |
Comorbidity | Â | Â | Â | Â |
 Diabetes | 2 | 1 | 0.215b | > 0.05 |
 Venous insufficiency | 0 | 1 | 1.197b | > 0.05 |
Injure mechanism | Â | Â | Â | Â |
 Falling accident | 18 | 12 | 0.087a | > 0.05 |
 Traffic accident | 3 | 6 | ||
Sanders classification | Â | Â | Â | Â |
 Type II | 12 | 10 | 0.487a | > 0.05 |
 Type III | 7 | 5 | ||
 Type IV | 2 | 3 | ||
Preoperative waiting time (days) | 3.7 ± 1.6 | 6.9 ± 2.0 | − 5.56b | < 0.05 |
Operation time (mins) | 88.8 ± 9.8 | 91.3 ± 12.1 | − 0.72b | > 0.05 |
Hospital stay (days) | 7.2 ± 1.7 | 12.4 ± 1.5 | − 9.87b | < 0.05 |